From c6af53f038aa32cec12e8a305ba07c7ef168f1b0 Mon Sep 17 00:00:00 2001
From: "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>
Date: Tue, 4 Jan 2022 12:07:00 +0000
Subject: [PATCH 2/3] net: mdio: add helpers to extract clause 45 regad and
 devad fields

Add a couple of helpers and definitions to extract the clause 45 regad
and devad fields from the regnum passed into MDIO drivers.

Tested-by: Daniel Golle <daniel@makrotopia.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 include/linux/mdio.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

--- a/include/linux/mdio.h
+++ b/include/linux/mdio.h
@@ -7,6 +7,7 @@
 #define __LINUX_MDIO_H__
 
 #include <uapi/linux/mdio.h>
+#include <linux/bitfield.h>
 #include <linux/mod_devicetable.h>
 
 /* Or MII_ADDR_C45 into regnum for read/write on mii_bus to enable the 21 bit
@@ -14,6 +15,7 @@
  */
 #define MII_ADDR_C45		(1<<30)
 #define MII_DEVADDR_C45_SHIFT	16
+#define MII_DEVADDR_C45_MASK	GENMASK(20, 16)
 #define MII_REGADDR_C45_MASK	GENMASK(15, 0)
 
 struct gpio_desc;
@@ -355,6 +357,16 @@ static inline u32 mdiobus_c45_addr(int d
 	return MII_ADDR_C45 | devad << MII_DEVADDR_C45_SHIFT | regnum;
 }
 
+static inline u16 mdiobus_c45_regad(u32 regnum)
+{
+	return FIELD_GET(MII_REGADDR_C45_MASK, regnum);
+}
+
+static inline u16 mdiobus_c45_devad(u32 regnum)
+{
+	return FIELD_GET(MII_DEVADDR_C45_MASK, regnum);
+}
+
 static inline int __mdiobus_c45_read(struct mii_bus *bus, int prtad, int devad,
 				     u16 regnum)
 {
